Interest Rates and Company Borrowings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest and debt expense:
Weighted average interest rate during the quarter	1.76%	1.52%	1.76%	1.50%
Interest rate at quarter end	1.61%	1.52%	1.61%	1.52%
Maximum amount outstanding during the quarter	$ 232,000	$ 25,000	$ 232,000	$ 25,000
Average amount outstanding during the quarter	202,977	25,000	172,740	24,590
Facility fees	$ 81	$ 64	$ 198	$ 156